Your best bet would probably be to use something like Illustrator or photoshop (or equivalent) and maybe ArcGIS or equivalent - not sure how important the exact coordinates are. If you do a search for theme park maps we had a really beautiful one posted here by somebody who makes them for a living (but it was more of a 'fun fair' type map). How many square miles /km are you looking to map? You could just use a google earth snapshot as your reference pic with all the Lats and Longs you need in it and build over that in illustrator or photoshop or equivalents.